variable speed AC well pumps [RE-wrenches]

[Doug Pratt]

Wrenches,

  We're talking about the Grundfos SQ-series of subpumps here aren't we? 
Or are there other brands of variable-speed subpumps on the market now? 
Don't I remember a thread a few months back about the 
SQ-series...several Wrenches endorsed them heartily...they work fine 
with modestly-sized sine or mod-sine inverters. Don't tell me I dreamed 
it all.

-Doug Pratt


David Henry wrote:
> Matt,
> 
> The variable speed pumps use a 1.5 or 2 hp motor and a variable 
> frequency drive.
> At full pump output that's the HP your inverter has to run. Also an 
> engineer at Franklin said they have a nasty ~7000 + watt surge when 
> your first turn them on that charges some capacitors in the 
> controller. After initial start up they have a soft start. I decided 
> not risk it. Also they have poor efficiency at low volumes.
> 
> David
> 
> David Henry
> Harmony Farm Supply
> 3244 Hwy 116 N.
> Sebastopol, Ca 95472
> voice 707-823-9125 X14
> fax 707-823-1734
> david at harmonyfarm.com
> www.harmonyfarm.com
> 

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